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A general revision of the Palaemonidae (Crustacea decapoda natantia) of the Americas. 1. The subfamilies Euryrhynchinae and Pontoniinae

A general revision of the Palaemonidae (Crustacea decapoda natantia) of the Americas. 1. The subfamilies Euryrhynchinae and Pontoniinae, Periclimenes (Periclimenes) yucatanicus, p. 38

38 ALLAN HANCOCK FOUNDATION OCCASIONAL PAPERS
Schmitt coll., Sta. 8-31). The other specimens are from near the upper
end at the west side of the lower section of White Shoal (7 fms, dip
with orange peel bucket, July 24, 1931, W. L. Schmitt coll., Sta. 41-31).
This material is deposited in the U.S. National Museum, Washington,
D.C.
Through the kindness of Dr. Marie V. Lebour I was able to examine
the type specimen of this species, which is preserved in the collection
of the Laboratory of the Marine Biological Association at Plymouth,
England.
The species was only known from the original record by Lebour
(1949) from Harrington Sound, Bermuda.
Remarks: The specimens from Sta. 41-31 were obtained from a
red sponge.
The species may be recognized immediately by the extremely short
fingers of the first and second legs.
Periclimenes (Periclimenes) yucatanicus (Ives)
PL 10, figs, a-1
Palaemonella Yucatanica Ives, 1891, Proc. Acad. Nat. Sci. Phila., 1891,
p. 183, pi. 5, fig. 8.
Palaemonella yucatanica Sharp, 1893, Proc. Acad. Nat. Sci. Phila.,
1893, p. 124; Borradaile, 1917, Trans. Linn. Soc. Lond. Zool.,
ser. 2, vol. 17, p. 358.
Description: The rostrum is rather narrow and directed obliquely
upwards. It reaches to the end of the antennular peduncle. The upper
margin bears 7 or 8 teeth, 2 of which are placed behind the orbit. The
first tooth is placed slightly in front of the middle of the carapace (in
my specimen the distance between this tooth and the posterior margin
of the orbit is %3 of the length of the carapace, rostrum excluded). The
second tooth is placed slightly behind the orbit and is separated from the
first tooth by a distance which is much larger than the distances between
the other teeth. These latter teeth are regularly divided over the rostrum.
The lower margin of the rostrum bears 2 or 3 teeth in the distal part.
In the Hancock specimen the rostrum is broken. The carapace possesses
no supraorbital spine, but both the antennal and hepatic spines are
present. The lower orbital angle is strongly anteriorly produced.
The abdomen has all the pleurae broadly rounded. The third segment is produced in the median part of the posterior margin, forming a
distinct hump. The sixth segment is almost twice as long as the fifth and
% as long as the telson. The telson is provided with the usual 2 dorsal

38 ALLAN HANCOCK FOUNDATION OCCASIONAL PAPERS
Schmitt coll., Sta. 8-31). The other specimens are from near the upper
end at the west side of the lower section of White Shoal (7 fms, dip
with orange peel bucket, July 24, 1931, W. L. Schmitt coll., Sta. 41-31).
This material is deposited in the U.S. National Museum, Washington,
D.C.
Through the kindness of Dr. Marie V. Lebour I was able to examine
the type specimen of this species, which is preserved in the collection
of the Laboratory of the Marine Biological Association at Plymouth,
England.
The species was only known from the original record by Lebour
(1949) from Harrington Sound, Bermuda.
Remarks: The specimens from Sta. 41-31 were obtained from a
red sponge.
The species may be recognized immediately by the extremely short
fingers of the first and second legs.
Periclimenes (Periclimenes) yucatanicus (Ives)
PL 10, figs, a-1
Palaemonella Yucatanica Ives, 1891, Proc. Acad. Nat. Sci. Phila., 1891,
p. 183, pi. 5, fig. 8.
Palaemonella yucatanica Sharp, 1893, Proc. Acad. Nat. Sci. Phila.,
1893, p. 124; Borradaile, 1917, Trans. Linn. Soc. Lond. Zool.,
ser. 2, vol. 17, p. 358.
Description: The rostrum is rather narrow and directed obliquely
upwards. It reaches to the end of the antennular peduncle. The upper
margin bears 7 or 8 teeth, 2 of which are placed behind the orbit. The
first tooth is placed slightly in front of the middle of the carapace (in
my specimen the distance between this tooth and the posterior margin
of the orbit is %3 of the length of the carapace, rostrum excluded). The
second tooth is placed slightly behind the orbit and is separated from the
first tooth by a distance which is much larger than the distances between
the other teeth. These latter teeth are regularly divided over the rostrum.
The lower margin of the rostrum bears 2 or 3 teeth in the distal part.
In the Hancock specimen the rostrum is broken. The carapace possesses
no supraorbital spine, but both the antennal and hepatic spines are
present. The lower orbital angle is strongly anteriorly produced.
The abdomen has all the pleurae broadly rounded. The third segment is produced in the median part of the posterior margin, forming a
distinct hump. The sixth segment is almost twice as long as the fifth and
% as long as the telson. The telson is provided with the usual 2 dorsal